整式的加减计算题,整式的加减计算题初一简单一点

21．已知A=x3-2×2 x-4整式的加减计算题，B=2×3-5x 3，计算A B=______．

22．已知A=x3-2×2 x-4，B=2×3-5x 3，计算A-B=______．

23．若a=-0.2，b=0.5，代数式-(|a2b|-|ab2|)的值为______．

25．一个多项式减去3m4-m3-2m 5得-2m4-3m3-2m2-1，那么这个多项式等于______．

26．-(2×2-y2)-[2y2-(x2 2xy)]=______．

27．若-3a3b2与5ax-1by 2是同类项，则x=______，y=______．

28．(-y 6 3y4-y3)-(2y2-3y3 y4-7)＝______．

29．化简代数式4×2-[7×2-5x-3(1-2x x2)]的结果是______．

30．2a-b2 c-d3=2a ( )-d3=2a-d3-( )=c-( )．

31．3a-(2a-3b) 3(a-2b)-b=______．

32．化简代数式x-[y-2x-(x y)]等于______．

33．[5a2 ( )a-7] [( )a2-4a ( )]=a2 2a 1．

34．3x-[y-(2x y)]=______．

35．化简|1-x y|-|x-y|(其中x＜0，y＞0)等于______．

36．已知x≤y，x y-|x-y|=______．

37．已知x＜0，y＜0，化简|x y|-|5-x-y|=______．

38．4a2n-an-(3an-2a2n)＝______．

39．若一个多项式加上-3x2y 2×2-3xy-4得

2x2y 3xy2-x2 2xy，

则这个多项式为______．

40．-5xm-xm-(-7xm) (-3xm)=______．

41．当a=-1，b=-2时，

[a-(b-c)]-[-b-(-c-a)]＝______．

43．当a=-1，b=1，c=-1时，

-[b-2(-5a)]-(-3b 5c)＝______．

44．-2(3x z)-(-6x) (-5y 3z)=______．

45．-5an-an 1-(-7an 1) (-3an)＝______．

46．3a-(2a-4b-6c) 3(-2c 2b)=______．

48．9a2 [7a2-2a-(-a2 3a)]=______．

50．当2y-x=5时，5(x-2y)2-3(-x 2y)-100=______．

．(4×2-8x 5)-(x3 3×2-6x 2)．

72．(0.3×3-x2y xy2-y3)-(-0.5×3-x2y 0.3xy2)．

73．-{2a2b-[3abc-(4ab2-a2b)]｝．

74．(5a2b 3a2b2-ab2)-(-2ab2 3a2b2 a2b)．

75．(x2-2y2-z2)-(-y2 3×2-z2) (5×2-y2 2z2)．

76．(3a6-a4 2a5-4a3-1)-(2-a a3-a5-a4)．

77．(4a-2b-c)-5a-[8b-2c-(a b)]．

78．(2m-3n)-(3m-2n) (5n m)．

79．(3a2-4ab-5b2)-(2b2-5a2 2ab)-(-6ab)．

80．xy-(2xy-3z) (3xy-4z)．

81．(-3×3 2×2-5x 1)-(5-6x-x2 x3)．

83．3x-(2x-4y-6x) 3(-2z 2y)．

84．(-x2 4 3×4-x3)-(x2 2x-x4-5)．

85．若A=5a2-2ab 3b2，B=-2b2 3ab-a2，计算A B．

86．已知A=3a2-5a-12，B=2a2 3a-4，求2(A-B)．

87．2m-{-3n [-4m-(3m-n)]｝．

88．5m2n (-2m2n) 2mn2-( m2n)．

89．4(x-y z)-2(x y-z)-3(-x-y-z)．

90．2(x2-2xy y2-3) (-x2 y2)-(x2 2xy y2)．

92．2(a2-ab-b2)-3(4a-2b) 2(7a2-4ab b2)．

93.2×2-｛-3x-[4×2-(3×2-x) (x-x2)]｝．

94：-(7x-y-2z)-｛[4x-(x-y-z)-3x z]-x｝．

95：( 3a) (-5a) (-7a) (-31a)-( 4a)-(-8a)．

96：a3-(a2-a) (a2-a 1)-(1-a4 a3)．

97．4x-2(x-3)-3[x-3(4-2x) 8]．